renterd host context menu copy, redundancy tooltip, prune validation, refine contract graph

[alexfreska]

• The host context menu now has options for copying public key or address to clipboard.
• The redundancy tooltip now correctly describes the ratio as total shards / min shards. Correct the redundancy explanation in the UI renterd#810
• Fixed an issue with the prune sector roots setting validation. Cannot save config with sector roots pruning disabled renterd#812

[changeset-bot]

🦋 Changeset detected

Latest commit: f1fd34d

The changes in this PR will be included in the next version bump.

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Name	Type
renterd	Minor

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